Detection apparatus for finding holes in webs

Details Detection apparatus for finding holes in webs Detection apparatus for finding holes in webs

1979-02-14

1981-11-24

Corbin, John K.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250224, 250572, 350171, G01N 2189

Patent

active

043021050

ABSTRACT:
Detection apparatus for finding holes in moving webs uses a row of individual mutually sideways displaced stepped mirror strips in combination with a scanning device which periodically scans a light beam from a laser over the individual mirrors of each strip, to generate a scanning light curtain directed at the surface of a web. A detection device comprising a row of individual Fresnel lenses and associated photoelectronic detectors is arranged parallel to the row of mirror strips to receive light transmitted through any hole present in the web. The individual Fresnel lenses focus any light received onto their associated photoelectric detectors the outputs from which signify the presence of the hole. Means are provided for introducing a degree of divergence into the beams deflected from the stepped mirrors and forming the light curtain whereby the light curtain scans a cross the web without gaps.

REFERENCES:
patent: 4011857 (1977-03-01), Rice
patent: 4127771 (1978-11-01), Sick

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